Crayola has just come out with a new product called "Wet Set" clay. It is
soft and pliable for young children, but hardens in water after about three
hours. I'm not really sure what the exact makeup of the product is, but it
is AP Nontoxic and conforms to ASTM D4236 and ANSI Z356.4 regulations.
Assistant Professor of Art
Central Connecticut State University